(transitive) usually foll by up. to liven by imbuing with new vigour
C20: short for pepper
personal equity plan: a method of saving in the U.K. with certain tax advantages, in which investments up to a fixed annual value can be purchased: replaced by the ISA in 1999 but arrangements for existing PEPs remain unchanged
"vigor, energy," 1912, shortened form of pepper (n.), which was used in the figurative sense of "spirit, energy" from at least 1847. Pep rally is attested from 1945; pep talk from 1926. To pep (something) up is from 1925.